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Stock-Based Compensation Plans and Employee Benefits (401(k) Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Requisite service period	3 months
Defined contribution plan maximum percentage of matching contribution	50.00%
Defined contribution plan maximum percentage of employee compensation	10.00%
Gross contributions made by the Company	$ 0.9	$ 1.1	$ 0.9

X

- Definition

At the discretion of the Board of Directors, represents the maximum percentage matching contribution which the Company may make of the first ten percent of the participant's annual compensation.

+ References

No definition available.

+ Details

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X

- Definition

Represents the period of continuous service with the Company required in order to be eligible to participate in the 401(k) Plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

X

- References

No definition available.

+ Details

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